Bobro Engineering B10-300-300-20 Dual Ring Dual Lever 30mm 20MOA Heavy duty, zero-repeatable optics mount for your weapon platform Blac lever System which requires no manual adjustment to attain a proper, rock solid engagement on a 1913 Picatinny rail This mount requires absolutely no user adjustment, will not damage even polymer rail System Mil-Spec type III hard coat anodized in matte black